when you plug it into the wall, a red light shows up to let you know it's charging. it disappears when it is fully charged.
I've had my 505 for around 19 months, and I do have the original wall charger as well as a usb. I generally charge it via usb when I download new books, but I have used the wall charger several times when the battery has gotten much lower, or when I wanted to charge it quickly and wasn't using the computer at all. I only remember seeing the red light when it's plugged into the wall.
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